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Geometry editing for E+ idf files

Project description

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GeomEppy is a scripting language for use with Eppy, which in turn is a scripting language for EnergyPlus IDF files and output files.

It primarily adds functions to do with IDF geometry, including zones, surfaces, constructions, etc.

Installation

GeomEppy requires Numpy, Shapely, and optionally Matplotlib.

To install GeomEppy, call pip install geomeppy.

API

The API for GeomEppy depends on replacing an Eppy IDF object with a GeomEppy IDF object. To use this, you will need to import IDF from GeomEppy rather than directly from Eppy.

In your scripts, use from geomeppy import IDF instead of from eppy.modeleditor import IDF. All other features of the current release version of Eppy will still be available.

GeomEppy then provides a simple Python API for actions on the IDF object:

  • Intersecting and matching surfaces

IDF.intersect()  # intersects all surfaces

IDF.match()  # sets boundary conditions of surfaces

IDF.intersect_match()  # intersect surfaces then set/update boundary conditions

  • Moving an IDF

IDF.translate_to_origin()  # move the whole IDF close to 0,0 on the x, y axes

IDF.translate([50, 20])  # move the whole IDF to x + 50, y + 20

IDF.translate([0, 0, 10])  # move the whole IDF to z + 10

  • Rotating an IDF

IDF.rotate(90)  # rotate the IDF 90 degrees counterclockwise around the centre of its bounding box

IDF.scale(2)  # scale the IDF to double its size (default is on the xy axes)

IDF.scale(2, axes='xy')  # scale the IDF to double its size (in the xy axes)

IDF.scale(2, axes='z')  # scale the IDF to double its size (in the z axis)

  • Adding windows to external walls

IDF.set_wwr()  # set a WWR of 20% (the default) for all external walls

IDF.set_wwr(wwr=0.25)  # set a WWR of 25% for all external walls

IDF.set_wwr(wwr_map={90: 0})  # set no windows on all external walls with azimuth of 90, and WWR of 20% on other walls

IDF.set_wwr(wwr=0, wwr_map={90: 0.3})  # set a WWR of 30% for all external walls with azimuth of 90, and no windows on other walls

If wwr_map is passed, it overrides any value passed to wwr, including the default of 0.2. However it only overrides it on walls which have an azimuth in the wwr_map. Any omitted walls’ WWR will be set to the value in wwr. If you want to specify no windows for walls which are not specified in wwr_map, you must also set wwr=None.

  • Setting constructions

IDF.set_default_constructions()  # set a name for each construction in the model

  • Viewing a simple 3D representation of an IDF

IDF.view_model()  # shows a zoomable, rotatable transparent model

  • Get all surfaces in a model

IDF.getsurfaces()

  • Get all surfaces in a model of a given type

IDF.getsurfaces('wall')  # only works if the surface type has been set in the IDF

  • Get all subsurfaces in a model

IDF.getsubsurfaces()

  • Get all subsurfaces in a model of a given type

IDF.getsubsurfaces('window')  # only works if the surface type has been set in the IDF

  • Automatic geometry building

IDF.add_block(...)  # automatically adds a building block to the IDF

This method requires some explanation. The parameters required are:

name : str
    A name for the block.
coordinates : list
    A list of (x, y) tuples representing the building outline.
height : float
    The height of the block roof above ground level.
num_stories : int, optional
    The total number of stories including basement stories. Default : 1.
below_ground_stories : int, optional
    The number of stories below ground. Default : 0.
below_ground_storey_height : float, optional
    The height of each basement storey. Default : 2.5.
zoning : str, optional
    The rules to use in creating zones. Currently the only option is `by_storey` which sets each storey in the block as a Zone.

The block generated will have boundary conditions set correctly and any intersections with adjacent blocks will be handled automatically. The surface type will be set to wall, floor, ceiling or roof for each surface. Constructions are not set automatically so these will need to be added afterwards in the normal way for Eppy.

Other functions

GeomEppy also provides some additional functions such as surface.setcoords(...)

wall = idf.newidfobject(
    'BUILDINGSURFACE:DETAILED', 'awall',
    Surface_Type = 'wall')
wall.setcoords([(0,0,1),(0,0,0),(1,0,0),(1,0,1)])

Forthcoming

  • Geometry validation and correction
  • Geometry simplification
  • Better geometry visualisation

Project details


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